Night Light of San Juan (Alajuela) from space (Costa Rica) Src. Average luminocity for 10x10km area is 43.5248% and for 50x50km: 22.9029%.
Square area 10x10 km:
 1.03%
 6.4%
 5.79%
 5.58%
 12.19%
 9.71%
 10.54%
 10.74%
 8.68%
 21.69%
 7.64%Square area 50x50 km:
 4.38%
 3.88%
 2.58%
 2.26%
 3.58%
 3.72%
 4.07%
 4.06%
 5.88%
 8.24%
 57.35%Clear (daylight) street map image can be seen on geolist.org.
Map coordinates:
10° 47' 38.2" North, 85° 1' 12.3" West
10° 6' 8.9" North, 84° 19' 1" West
9° 24' 34.3" North, 83° 36' 49.8" West
Some cities around San Juan sort by population:
• Alajuela
		15 km =9.3 mi, 
129°
• Naranjo
		6.7 km =4.2 mi, 
266°
• San Antonio
		19.7 km =12.2 mi, 
132°
• San Ramón
		16.9 km =10.5 mi, 
264°
• Río Segundo
		16 km =9.9 mi, 
14°
• Atenas
		15.7 km =9.8 mi, 
205°
• Llorente
		21.2 km =13.2 mi, 
123°
• Santo Domingo
		18.2 km =11.3 mi, 
103°
Sources (retrieved 2019-11-25):
» Earth at Night: Flat Maps 2012, 2016